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Decomposition of fluid forcing and phase synchronisation for in-line vortex-induced vibration of a circular cylinder

Published online by Cambridge University Press:  12 May 2022

Jisheng Zhao Open the ORCID record for Jisheng Zhao [Opens in a new window] ,
Mark C. Thompson Open the ORCID record for Mark C. Thompson [Opens in a new window]  and
Kerry Hourigan Open the ORCID record for Kerry Hourigan [Opens in a new window]
Jisheng Zhao*
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Victoria 3800, Australia
Mark C. Thompson
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Victoria 3800, Australia
Kerry Hourigan
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Victoria 3800, Australia
*
†Email address for correspondence: jisheng.zhao@monash.edu
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Abstract

We present a decomposition of the streamwise fluid force for in-line vortex-induced vibration (VIV) to provide insight into how the wake drag acts as a driving force in fluid–structure interaction. This force decomposition is an extension of that proposed in the recent work of Konstantinidis et al. (J. Fluid Mech., vol. 907, 2021, p. A34), and is applied to and validated by our experiments examining a circular cylinder freely vibrating in line with the free stream. It is revealed from the decomposition and linear analysis that two regimes of significant vibration are in phase synchronisation, while they are separated by a desynchronised regime marked by competition between non-stationary frequency responses of the cylinder vibration and the vortex shedding. Of interest, such a near-resonance desynchronisation regime is not seen in the transverse vibration case.

JFM classification

Aerodynamics: Flow-structure interactions Vortex Flows: Vortex dynamics Wakes/Jets: Wakes
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 941 , 25 June 2022 , R4
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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References

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Zhao et al. supplementary movie 1

Phase-averaged vorticity contours showing the wake evolutions at U* = [1.60, 1.80, 2.00, 2.15, 2.25, 2.30, 2.40] in regime I.

Download Zhao et al. supplementary movie 1(Video)
Video 5.6 MB

Zhao et al. supplementary movie 2

Phase-averaged vorticity contours showing the wake evolutions at U* = 2.55 (in the competing region) and 4.80 (in the desynchronisation region).

Download Zhao et al. supplementary movie 2(Video)
Video 2.7 MB

Zhao et al. supplementary movie 3

Phase-averaged vorticity contours showing the wake evolutions at U* = [3.00, 3.50, 4.20] in regime II.

Download Zhao et al. supplementary movie 3(Video)
Video 2.4 MB